William



(No Model.)

W. S. (JARLISLE.

MECHANICAL MOVEMENT.

No. 317,723. Patented May 12 1885.

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Inventor,

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NITE STATES WILLIAM S. GARLISLE, OF WATERTOWN, NEW YORK, ASSIGNOR TOPATENT rrrcn.

THE

DAVIS SEWING MACHINE COMPANY, OF SAME PLACE.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 317,723, dated May 12,1885.

Application filed November 15, 1884. (N model.)

To all whom it may concern:

Be it known that I, WILLIAM S. OARLISLE, of Watertown, in the county ofJefferson and State of New York, have invented a new and usefulImprovement in Mechanical Movements, which improvement is fully setforth in the following specification.

This invention has reference to a new mechanism for imparting a variableor adjustable stroke from a cam. The mechanism belongs to that class inwhich the cam acts upon a lever whose fulcrum is adjustable lengthwiseof the same, so as to increase or diminish the relativelength of the twoarms of the lever, and thus increase or diminish the throw of the deviceacted upon by the said lever. With such mechanism the adjustment can bemade while maintaining one end of the lever always in contact with thecam.

The invention consists, first, in placing the fulcrum on a pivoted armadjustable in the arc of a circle. Heretofore it has always been placedupon a slide adjustable in a right line. The pivoted arm is a simplerdevice, easier made, and less liable to get outof order.

The invention consists, secondly, in adjusting the pivoted arm carriedby a curved rack and a pinion meshing therewith.

The invention consists, thirdly, in making the fulcrum-piece (pin, roll,or whatever device may be used) ladj ustable on the pivoted arm.

The invention consists, fourthly, in connecting the lever with the armof a second lever, which latter turns on a fixed pin or stud, andsupports the primary lever as well as receives motion from it, thefulcrum of the primary lever being adjustable lengthwise of the same.

Heretofore a lever having a fulcrum adjustable lengthwise of the samehas been pivoted to a slide to be reciprocated thereby, and a primarylever has also been pivoted to and supported by a second lever, to whichit imparted motion, said second lever turning on a fixed pivot but inthis latter case the fulcrum of the primary lever was not adj ustablelengthwise of the same.

The invention consists,fifthly, in the combination of the cam, theprimary lever acted upon by said cam, the second lever, with which saidprimary lever is connected, the pivoted chines.

cam carrying the fulcrum of said priinarylever, and the spring forholding the end of the primary lever or a device carried thereby againstthe cam.

The mechanism can be used in various ma- I have, for example, employedit to advance the vertical feeding devices of the Davis sewing-machine;but I do not intend to limit it to such use or combination.

In the Davis machine, as is well known tothosefamiliarwithsewing-machines,theneedlebar is moved forward while theneedle is in the fabric, so as to feed the work. In this it is assistedby a vertical feed-bar, (called the helper-bar,) which bears upon thefabric when the-needle is down, and is advanced with the needle-bar.When the needle rises, the helperbar is lifted also, and both arereturned to their first position, leaving the fabric in the position towhich it has been advanced. The needle-bar and-helper-bar then descend,and are advanced, feeding the fabric another stitch. It is this advanceor feed movement of the needle-bar and helper-bar which the mechanismmay be used to impart.

The accompanying drawings illustrate what is considered the best mode ofapplying the principle of the invention.

Figure 1 is a front elevationshowing the new mechanism located in thecam house or head of a Davis sewing-machine; and Fig. 2 is a verticalsection in a plane at right angles to the plane of Fig. 1, showing themode of supporting and operating the pinion for adjusting the movablefulcrum of the primary lever.

A is the cam-house; P, the shaft; 13, the shaft-head or feedcam; O, theneedle-bar; Q, the pin for giving vertical reciprocation to theneedle-bar D, the vertical feed-bar or helper-bar; E, the presser-bar;F, the clothplate; G, the spring to assist in returning the feed andneedle bars; H, the secondary lever in the form of a bell-crank; I, thefixed stud on which it turns; J, the primary lever; K, a spring; K, thepivoted arm, carrying the fulcrum of the primary lever; L, thefulcrumplate; 1 and 2, screws; N, the fulcrum piece or roll; 0, apinion; R, a stop-screw; S, a stop; T, the pinion-sleeve; U, theadjustingknob; V, a nut; W, a friction-spring or conical washer, and Zan anti-friction roller.

the stud I.

The secondary lever or bell-crank H is secured to the inside ofcam-house A by the stationary stud I. o The lower arm of the secondarylever or bell-crank carries the friction-roller Z, which bears againstthe needle-bar C, and the stop S and screw R are used to adjust it inproper position. To the other arm of the bell-crank is secured by arivet the primary lever J, which is free to turn on theconnecting-rivet. The upper end of the primary lever J has afriction-roller, that rests against the actuatingcam B, and ismaintained in contact by the flat-spring K, which is fastened to theback of the lever J, and at its free end bears against The side of theprimary lever adjacent to the fulcrum-roll N is made the part of a truecircle, described from the center of the screw M, when thefriction-roller in the end of feed-lever is in contact with the smallpart of cam B. To thebottom of the cam-house is secured by pivot-screw Mthe arm K, its outer edge being provided with gear-teeth, that areengaged by the pinion 0. To this arm K the fulcrum-plate L is secured bythe screws 1 and 2, and to the fulcrum-plate is riveted thefriction-roller N, constituting the adjustable fulcrum of the primarylever 'J. The fulcrum-plate being provided with a hole larger than thescrew 2, it can be adjusted to bring the roll N into contact with thecurved side of primary lever J. The fulcrum-plate has also a projectionthat acts as a stop to prevent the pivoted arm K from being turned toofar, so that injury would be done to the machine. The cam B is so shapedthat it actuates the primaryleverin the proper time as compared with theneedle-bar and other parts of the machine. Of course, in applying theinvention to other machines, whether for sewing or other purpose, thecam would be made of the proper shape to give the desired movement. Thecam B is attached to the revolving shaft P, and the shaft revolves inthe direction of the arrow. The shaft of pinion 0 passes through thesleeve T, fixed in a hole in the back of camhouse A, and is held inposition by the sleeve T, knob U, turning with the shaft, and nut V,screwed on the end of said shaft.

To prevent the knob from turning accidentally, a thin steel concavewasher, W, is placed between it and the outer end of sleeve T. When theshaft P is rotated in the direction of the arrow, the surface from 3 to5 of the cam moves the upper end of the primary lever away from the axisof the shaft. The roll N, resting against the primary lever, operates asa fulcrum, and the lower end of said lever, attached to the bell-crankor secondary lever, is moved a distance corresponding to the position ofthe roll. When the fulcrum is at the lowest point, very little motion iscommunicated, and when shifted toward the upper end of the primary levermore movement is obtained. The primary lever and bellcrank beingconnected together, the bell-crank is rocked, and the roll Z imparts acorrespending lateral movement to the needle-bar and feed-bar at thesame time, thus accomplishing the feed. The cam at the proper timeallows the levers to return to their first position, andthe needle andfeed bars are returned to their first or vertical position by the springG. The pivoted arm K and fulcrum N are adjusted by turning the knob U,whereby the pinion O is also turned, and through it the teeth at the endof the arm K and fulcrum N are adjusted.

It is apparent that the friction-roller N is always in contact with theprimary lever, and that the friction-roller at the upper end of lever Jis always in contact with the actuating-cam B. On this cam the pointsbetween 3 and 4c and 5 and 6 are parts of a true circle described fromthe center of the shaft, and the intermediate points incline to move theleverJ and permit it to return in the proper time. The contact beingcontinuous, there is no noise from the mechanism.

In the above description I have given what is considered the best modeof applying the principle of the invention, in order that those skilledin the art may be able to use the same in the most perfect form known tome; but it should be understood that, except so far as those essentialmatters are concerned which are herein pointed out as constituting thesubstance of the invention, said description is only by way of exampleor illustration.

The mechanism for moving the needle-bar and feed or helper barvertically up and down has not been described, because it is or may besuch as is commonly employed in the Davis sewing-machine, and because itdoes not in itself form a part of the invention.

Having now fully described my said invention and the manner in which thesame is or may be carried into effect, what I claim is 1. Thecombination, with the cam and the primary lever having one end or adevice carried thereby in contact with said cam, of

the fulcrum to said lever and the pivoted arm carrying the said fulcrum,the latter being adjustable lengthwise of said lever in the arc of acircle whose center is the pivot of said arm, substantially asdescribed.

2. The combination, with the cam, the primary lever, and the fulcrum tosaid lever, of the pivoted arm carrying the fulcrum, and provided withgear-teeth, and the pinion meshing with said teeth for adjusting theposition I of said fulcrum, substantially as described.

3; The combination, with the cam, the primary lever, and the pivotedarm, of the fulcrum to said lever carried by said arm and adjustablethereon, substantially as described.

4:. The combination, with the primary lever, the fulcrum adjustablelengthwise of the same, and the cam for actuating said lever, of thesecondary lever turning on a fixed stud or pivot, and connected with theprimary, which it supports, and from which it receives motion,substantially as described.

5. The combination of the cam, the primary lever, the fulcrum to saidlever, the pivoted adjustable arm carrying said fulcrum, the secondarylever, and the spring for holding the 5 end of the primary lever againstthe calm, substantially as described.

In testimony whereof I have signed this specification in presence of twosubscribing Witnesses.

WILLIAM S. OARLISLE.

Witnesses JAMES C. BURT, E. J. PARMELEE.

